Представьте в виде дроби:
а) a+b b
------- - ---
x x
б) a a-b
--- - -----
y y

в) x+y 2y-x
------ + ------
3c 3c

г) 10b+5 1-4b
----------- + -------
6a 6a

Д) 5x-3y 8y-5x
----------- + --------
10x 10x

е) x^2 - 2y^2 x^2-7y^2
----------------- - --------------
5xy 5xy
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